javascript - 为什么导航栏会向下滑动变窄然后变宽？-6ren

javascript - 为什么导航栏会向下滑动变窄然后变宽？

转载作者：行者123 更新时间：2023-11-28 09:10:27

当你将鼠标悬停在我网站上的一个 nav li 元素上时，它应该会滑下 nav ul ul 元素，但是当它由于某种原因向下滑动时它很瘦，然后变宽了。请查看我的 JSFiddle 并帮助我:D

JSFiddle Demo

HTML:

    <body>
    <header>
        <nav>
            <ul>
                <li><a href="index.html">Home</a>
                <ul>
                    <li><a href="about.html">About Me</a></li>
                </ul>
                </li>
                <li><a href="purpose.html">Purposeful Living</a>
                <ul>
                    <li><a href="purpose78.html">7th - 8th</a></li>
                    <li><a href="purpose910.html">9th - 10th</a></li>
                    <li><a href="purpose1112.html">11th - 12th</a></li>
                </ul>
                </li>
                <li><a href="academic.html">Academic Excellence</a>
                <ul>
                    <li><a href="purpose78.html">7th - 8th</a></li>
                    <li><a href="purpose910.html">9th - 10th</a></li>
                    <li><a href="purpose1112.html">11th - 12th</a></li>
                </ul>
                </li>
                <li><a href="ethical.html">Ethical Responsibility</a>
                <ul>
                    <li><a href="purpose78.html">7th - 8th</a></li>
                    <li><a href="purpose910.html">9th - 10th</a></li>
                    <li><a href="purpose1112.html">11th - 12th</a></li>
                </ul>
                </li>
            </ul>
        </nav>
    </header>
    <div id="headershow">Toggle Nav Bar</div>
    <div id="mainnamesection">
        <h1 id="mainname">
        Title
        </h1>
        <div id="flyingsection">
    </div>
        <h1 id="mainname1">
        <span id="smallname">Subtitle</span>
        </h1>
    </div>
</body>

Javascript/Jquery:

    $(document).ready(function() {



$("#smallname").click(function() {

$("html, body").animate({scrollTop: "0px"});

});         

$("#headershow").click(function() {

$("header").slideToggle();

});

$(".grades td a").mouseover(function() {
$(this).animate({backgroundColor: "white", color: "black"}, 200);
$(this).mouseleave(function() {
$(this).animate({backgroundColor: "transparent", color: "white"}, 200);
});
});

$('nav li').hover(
function () {
$('ul', this).slideDown();
},
function () {
$('ul', this).stop().slideUp();
}
);          

});

CSS:

`    @import url(http://fonts.googleapis.com/css?family=Open+Sans);



    body {
    background-image: url(file:///Users/jakesager/Desktop/Websites/Jake%20Sager/img/starrynight.jpg);
    background-size: 110%;
    background-position: center -100px;
    background-attachment: fixed;
    margin:0;
    padding:0;
}

header {
    width: 100%;
    margin:auto;
    background: rgba(255,255,255,0.7);
    height: 60px;
    z-index: 20;
    display: none;
}

.inline {
    display: inline-block;
}

#flyingbird {
    height: 60px;
    width: 90px;
    left: 100px;
    position: relative;
    top: -30px;
}

#bird {
    height: 60px;
    width: 90px;
    display: inline-block;
    position: relative;
    top: 15px;
    z-index: 1;
}

#flyingsection {
    width: 700px;
    margin:auto;
    margin-top: 0px;
    margin-bottom: 0px;
}

nav {
    height: 60px;
    margin-top: 0px;
    text-align: center;
    z-index: 20;
}

nav ul ul {
    display:none;
}

#headershow {
    background-color: rgba(255,255,255,0.7);
    position: static;
    left: 0;
    top: 0;
    width: 125px;
    text-align:center;
    border-bottom-right-radius: 10px;
    padding: 5px;
    height: 20px;
    cursor: pointer;
    font-family: open sans;
}

nav ul {
    list-style:none;
    display: inline-table;
    position:relative;
    padding: 0;
    font-family: open sans;
    display: inline-block;
}

nav ul li {
    float: left;
    margin-top: -16px;
    border-right: 2px solid black;
    text-align:center;
    height: 60px;
    padding-left: 25px;
    padding-right: 25px;
}

nav ul li:last-child {
    border-right: none;
}

nav ul li a {
    color:black;
    text-decoration: none;
    padding-top: 15px;
    padding-bottom: 15px;
    padding-left: 5px;
    padding-right: 5px;
    position: relative;
    top: 18px;
}

nav ul li:first-child {
    border-left: 2px solid black;
}

nav ul li:last-child {
    border-right: 2px solid black;
}

nav ul li:hover {
    background: rgba(255,255,255,0.6)
}
nav ul ul {
    position: absolute;
    top: 100%;
    z-index: 20;
}

nav ul ul li {
    float:none;
    background-color: rgba(255,255,255,0.82);
    width: 100%;
    margin-top: 0;
    margin-left: -27px;
    border-left: 2px solid black;
    border-right: 2px solid black;
    border-top: 1px solid black;
}
nav ul ul li:last-child {
    border-bottom: 2px solid black;
}

nav ul ul li:hover {
    background-color: rgba(255,255,255,0.9);
}

#mainnamesection {
    width: 1050px;
    margin:auto;
}
#mainname {
    font-size: 180px;
    font-family: open sans;
    text-align:center;
    margin-top: 20px;
    color: white;
}
#mainname1 {
    font-size: 180px;
    font-family: open sans;
    text-align:center;
    color: white;
    margin-top: -100px;
}
#smallname {
    font-size: 50px;
    font-family: open sans;
    color: #47BCEA;
}

nav ul ul {
    margin-left: 0;
}

.maincontent {
    width: 100%;
    margin-top: 30px;
    padding-top: 7px;
    padding-bottom: 10px;
    color: white;
}

.maincontent p {
    font-family: open sans;
    margin-left: 20px;
    font-size: 18px;
}

.maincontent h1 {
    font-family: open sans;
    margin-left: 20px;
}

.grades {
    margin-left: 20px;
    background-color: rgba(000,000,000, 0.7);
    font-family: open sans;
    font-size: 23px;
}

.grades td {
    padding: 10px;
    border-right: 2px solid white;
}

.grades td:last-child {
    border: none;
}

.grades td a {
    width: 100%;
    color: white;
    text-decoration: none;
    padding: 5px;
}

.wrapper {
    width: 941px;
    margin:auto;
}
.maintitle {
    font-family: Open sans;
    margin-left: 20px;
}

.mainparagraph {
    font-family: Open sans;
    margin-left: 20px;
}

最佳答案

动画期间overflow设置为 hidden .当动画完成内联时 overflow样式已删除。

您在子菜单上设置了负边距 <li>因此，当动画正在进行时，父级外部的部分是不可见的。

建议您删除负边距并设置 <ul>至 left:0

关于javascript - 为什么导航栏会向下滑动变窄然后变宽？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26539367/

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javascript - 为什么导航栏会向下滑动变窄然后变宽？